
MODCELL Multiloop Processor
COMMUNICATIONS CONNECTIONS
Figure 4-7. Typical Modbus Connections for 2034N RS-485, 4-Wire Module used as a Master
Isolated +5Vdc
2034N RS-485 MODULE
(Module Locations 31 & 32)
560
Ohm
TERM
Switch
YES
Isolated +5Vdc
TX-
TX+
S32
BASE INSTRUMENT
LOWER
TERMINAL
HOUSING
2034N RS-485 MODULE
(Module Locations 31 & 32)
1
22
1
120 Ohm
Other Slaves
Modbus Slave
TX-
TX+
120 Ohm
Last Slave
Note: All resistors are 0.25W
RX-
RX+
S31
13
142
1
560 Ohm
TERM
Switch
NO
120 Ohm
RX-
RX+
120 Ohm
S31
S32
1
2
1
2
BASE INSTRUMENT
Modbus Master
Isolated
Common
58
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